Easily Regenerated Readily Deployable Absorbent for Heavy Metal Removal from Contaminated Water.

Area of Science:

• Environmental Science
• Materials Science
• Chemistry

Background:

• Growing concerns over heavy metal contamination in water sources due to industrial activities and climate change.
• Limitations of existing adsorbents, such as graphene oxide (GO), which require a support for optimal performance.
• Need for efficient and regenerable materials to treat contaminated water.

Purpose of the Study:

• To prepare and characterize a supported epoxidized carbon nanotube (SENT) adsorbent.
• To evaluate the heavy metal adsorption capacity and efficiency of SENT.
• To assess the regenerability of the SENT adsorbent for practical applications.

Main Methods:

• Growth of multi-walled carbon nanotubes (MWNTs) on a quartz substrate.
• Epoxidation of MWNTs to create functional sites for heavy metal adsorption.
• Adsorption experiments using various heavy metals (Cd2+, Co2+, Cu2+, Hg2+, Ni2+, Pb2+) at high concentrations.

Main Results:

• SENT demonstrated >99.4% adsorption efficiency for all tested heavy metals.
• The saturation concentration of SENT was significantly higher than that of GO or acid-treated MWNTs.
• SENT adsorbent was successfully regenerated using vinegar, a common household chemical.

Conclusions:

• Supported epoxidized carbon nanotubes (SENT) are highly effective for removing heavy metals from contaminated water.
• SENT offers superior adsorption capacity and regenerability compared to other materials.
• SENT presents a promising, sustainable solution for industrial wastewater treatment, capable of purifying large volumes of water to meet WHO standards.